EP 0109696 B1 19870610 - CIRCUIT FOR FAIL SAFE CONTROL OF A SYSTEM
Title (en)
CIRCUIT FOR FAIL SAFE CONTROL OF A SYSTEM
Publication
Application
Priority
NL 8203734 A 19820927
Abstract (en)
[origin: EP0109696A1] The invention relates to a circuit for fail safe control of a system comprising a command switch, closing of which activates a control relay so that through the switched over contacts of said control relay a holding path for said control relay is closed. The circuit furthermore comprises an auxiliary relay and a capacitor, which capacitor after closing of the command switch only through at least a normally closed contact of the control relay can be charged to a predetermined voltage before the control relay is energized. Said control relay is energized through an energizing path containing at least one contact of the auxiliary relay offering the possibility to check a switching device, and is maintained in the energized state through a contact of the control relay. The capacitor is after energizing of the control relay connected to the auxiliary relay through at least one of the now switched over contacts of said control relay and forms during a predetermined period the only voltage source for said auxiliary relay, energizing said auxiliary relay.
IPC 1-7
IPC 8 full level
F23N 5/20 (2006.01)
CPC (source: EP)
F23N 5/203 (2013.01); F23N 2227/28 (2020.01); F23N 2229/00 (2020.01); F23N 2231/06 (2020.01); F23N 2231/12 (2020.01); F23N 2235/12 (2020.01)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0109696 A1 19840530; EP 0109696 B1 19870610; AT E27732 T1 19870615; DE 3372011 D1 19870716; NL 8203734 A 19840416
DOCDB simple family (application)
EP 83201384 A 19830927; AT 83201384 T 19830927; DE 3372011 T 19830927; NL 8203734 A 19820927